Device for improving EGR (exhaust gas recirculation) rate of gasoline engine

Abstract

The utility model discloses a device for improving the EGR rate of a gasoline engine, and relates to the technical field of gasoline engine research and development. The device comprises a corrugated pipe communicated with an air outlet of the EGR cooler, the end, opposite to the EGR cooler, of the corrugated pipe is arranged in a sealed mode, the pipe wall, close to the sealed end, of the corrugated pipe is communicated with a breather pipe, and the end, opposite to the corrugated pipe, of the breather pipe is communicated with the top wall of an air inlet manifold. A quick-assembly ball valve is mounted in the middle of the breather pipe; the purpose of rapidly and efficiently solving the problem of uneven EGR rate distribution is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of gasoline engine research and development, and in particular to a device for improving the EGR rate of a gasoline engine. Background Art

[0002] During the combustion development hardware selection test of gasoline engines, due to unreasonable selection and design of components, combustion, emissions and fuel consumption deteriorate during engine operation. Temporary modification of components is required to verify whether the components have improved the combustion conditions and pave the way for later batch production of parts. Uneven combustion or misfire of gasoline engines is mainly caused by uneven mixing of exhaust gas and intake air in the intake manifold and EGR, resulting in inconsistent exhaust gas content entering the four cylinders. The more exhaust gas entering the cylinder, the more serious the impact on the combustion, emissions and fuel consumption of the gasoline engine. Therefore, the design and layout of the intake manifold and EGR cooling pipeline are particularly important. In order to improve the uniform distribution of EGR rate, a reasonable test device is designed to solve the combustion uniformity of the four cylinders. Utility Model Content

[0003] The purpose of the utility model is to provide a device for improving the EGR rate of a gasoline engine, so as to achieve the purpose of quickly and efficiently solving the uneven distribution of the EGR rate.

[0004] In order to achieve the above purpose, the utility model adopts the following technical means:

[0005] A device for improving the EGR rate of a gasoline engine comprises a bellows connected to an outlet of an EGR cooler, the bellows being sealed at one end opposite to the EGR cooler, the bellows having a wall adjacent to the sealed end connected to a vent pipe, the vent pipe having an end opposite to the bellows connected to a top wall of an intake manifold, and a quick-release ball valve being installed in the middle of the vent pipe.

[0006] Preferably, both ends of the vent pipe are connected to the bellows and the intake manifold through ferrules respectively.

[0007] Furthermore, each of the intake manifolds is connected to one of the ventilation pipes, and all of the ventilation pipes are connected to the side wall of one of the corrugated pipes.

[0008] Furthermore, the communication openings of the vent pipe and the bellows are arranged in sequence along the flow direction of the fluid in the bellows.

[0009] The vent pipes are all connected to the side wall of one of the corrugated pipes.

[0010] Furthermore, the ventilation tube is a Teflon tetrafluoroethylene tube.

[0011] The vent pipes are all connected to the side wall of one of the corrugated pipes.

[0012] Furthermore, a gasket is installed at the communication port between the bellows and the EGR cooler, and a through hole is configured on the gasket for communication between the air outlet and the bellows.

[0013] During use, the utility model has the following beneficial effects:

[0014] First, the intake manifold of the gasoline engine is processed with measuring points, and each measuring point is evenly distributed on the manifold of the cylinder. Secondly, the outlet of the EGR cooler of the gasoline engine is connected to the bellows, one end of the EGR outlet bellows is sealed, and the breather pipe is fixed on the intake manifold and the bellows on the pipeline. Finally, the quick-release ball valve is installed in the middle of the breather pipe. During the operation of the gasoline engine, according to the combustion and emission conditions of each cylinder measured by the combustion analyzer, the opening of the quick-release ball valve is appropriately adjusted to meet the uniformity of the exhaust gas entering each cylinder, to ensure the uniformity of the gasoline engine EGR rate, thereby quickly and efficiently solving the uneven distribution of the EGR rate. This method can also be used to verify that the uneven combustion of the engine is caused by the uneven EGR rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the utility model.

[0016] Among them, 1-EGR cooler, 2-bellows, 3-breathing pipe, 4-intake manifold, 5-quick-release ball valve, 6-gasket. DETAILED DESCRIPTION

[0017] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0021] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the present invention is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0023] Please refer to Figure 1 As shown, a device for improving the EGR rate of a gasoline engine includes a bellows 2 connected to the air outlet of an EGR cooler 1, the bellows 2 is sealed at one end opposite to the EGR cooler 1, the wall of the bellows 2 near the sealed end is connected to a vent pipe 3, the end of the vent pipe 3 opposite to the bellows 2 is connected to the top wall of an intake manifold 4, and a quick-install ball valve 5 is installed in the middle of the vent pipe 3.

[0024] First, the intake manifold 4 of the gasoline engine is processed and measured, and each measuring point is evenly distributed on the manifold of the cylinder. Secondly, the outlet of the EGR cooler 1 of the gasoline engine is connected to the bellows 2, and one end of the EGR outlet bellows 2 is sealed. On the pipeline, the breather pipe 3 is fixed on the intake manifold 4 and the bellows 2. Finally, the quick-release ball valve 5 is installed in the middle of the breather pipe 3. During the operation of the gasoline engine, according to the combustion and emission conditions of each cylinder measured by the combustion analyzer, the opening of the quick-release ball valve 5 is appropriately adjusted to meet the uniformity of the exhaust gas entering each cylinder, to ensure the uniformity of the gasoline engine EGR rate, thereby quickly and efficiently solving the uneven distribution of the EGR rate. This method can also be used to verify that the uneven combustion of the engine is caused by the uneven EGR rate.

[0025] In order to facilitate the connection between the ventilation pipe 3 and the bellows 2 and the intake manifold 4, the two ends of the ventilation pipe 3 are connected to the bellows 2 and the intake manifold 4 respectively through a ferrule.

[0026] Furthermore, each of the intake manifolds 4 is connected to one of the ventilation pipes 3 , and all of the ventilation pipes 3 are connected to the side wall of one of the corrugated pipes 2 .

[0027] At the same time, the communication openings between the vent pipe 3 and the bellows 2 are arranged in sequence along the flow direction of the fluid in the bellows 2 .

[0028] In order to improve the durability of the ventilation tube 3 and the stability during the gas transmission process, the ventilation tube 3 is a Teflon tetrafluoroethylene tube.

[0029] Furthermore, a gasket 6 is installed at the communication port between the bellows 2 and the EGR cooler 1 , and a through hole is configured on the gasket 6 for communicating between the air outlet and the bellows 2 .

[0030] In this way, the exhaust gas from EGR and the fresh air can be fully mixed.

[0031] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for improving the EGR rate of a gasoline engine, characterized in that: The invention comprises a bellows (2) connected to the air outlet of the EGR cooler (1), wherein the end of the bellows (2) opposite to the EGR cooler (1) is sealed, the wall of the bellows (2) close to the sealed end is connected to the vent pipe (3), the end of the vent pipe (3) opposite to the bellows (2) is connected to the top wall of the intake manifold (4), and a quick-install ball valve (5) is installed in the middle of the vent pipe (3).

2. The device for improving the EGR rate of a gasoline engine according to claim 1, characterized in that: Both ends of the vent pipe (3) are connected to the bellows (2) and the intake manifold (4) through ferrules.

3. The device for improving the EGR rate of a gasoline engine according to claim 1, characterized in that: Each of the intake manifolds (4) is connected to a ventilation pipe (3), and all of the ventilation pipes (3) are connected to the side wall of a corrugated pipe (2).

4. The device for improving the EGR rate of a gasoline engine according to claim 3, characterized in that: The communication openings of the vent pipe (3) and the bellows (2) are arranged in sequence along the flow direction of the fluid in the bellows (2).

5. The device for improving the EGR rate of a gasoline engine according to any one of claims 1 to 4, characterized in that: The vent pipe (3) is a Teflon tetrafluoroethylene tube.

6. The device for improving the EGR rate of a gasoline engine according to claim 1, characterized in that: A gasket (6) is installed at the communication port between the bellows (2) and the EGR cooler (1), and a through hole is formed on the gasket (6) for communicating between the air outlet and the bellows (2).

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